Hi Michael I suppose you know this M.Dv: ? (and whole site: ) I'm going through this pdf - maybe there are some clues. -- Regards Maciek
Forum: General Discussions

Hi RHV929 Wrote: ------------------------------------------------------- > We managed the first German WW2 Naval ENIGMA M4 > TURINGBOMBE break since 1945. > Visit: and read > the original U534 messages for the first time > since nearly 70 years! The Germans used many > abbreviations and a special naval > language.Therefore naval ENIGMA M4 messages are > hard
Forum: General Discussions

Hi Kurt Here is "Design Study of Former German Submarine - Type XXI" You can also find usefull informations in Norman Friedman's books: "U.S. Submarines Through 1945" and "U.S. Submarines Since 1945" (in the end and beginning part respectively), which are available via google books. -- Regards Maciek
Forum: Technology and Operations

Hi Keith I have read very interesting discussion at www.rnsubs.co.uk. I would like to refer to the idea of running Junkers compressor when snorting. I think it's rather unlikely, that it was run when schnorcheling, as the Junkers worked on a two stroke cycle and the scavenging was sensitive to exhaust back-pressure. Moreover, Junkers exhaust could not be connected with schnorchel exhaust,
Forum: Technology and Operations

Hi Guys Diesel engines air intake manifold was not connected directly with air induction trunk (whichl later was conneted to the schnorchel head). The air induction trun was lead from the conning tower, outside the hull, toward the diesel engine room, where it passed through the hull, and then, along the pressure hull walls, down, under the floor plates. So any water which entered the trunk (e
Forum: General Discussions

Hi Keith Keith Hallam Wrote: ------------------------------------------------------- > I can see how the Junkers compressor works but I > can't find out where the diesel exhaust discharges > to? Diesel compressor discharged its exhaust fumes through its own hull valve either to its own exhaust silencer (type VIIC boats) or to the exhaust manifold of main diesel engines (
Forum: Technology and Operations

I forgot about one more thing, here (http://www.uboatarchive.net/U-177INT.htm) is available interrogation report of survivors from U-177. U-177 was type IXD2 boat, laid down two years before U-864. Here is the drawing of the machine rooms, where you can see two diesel compressors. Of course, as it is report from interrogation, it should be read with some distrust, but I think, that it
Forum: Technology and Operations

Hi Keith Keith Hallam Wrote: ------------------------------------------------------- > Hi, I'm following a thread on > concerning the sinking of > U-864 and was wondering if anyone knew if the boat > was fitted with a Junkers crankless diesel powered > HP air compressor? Well, I think, we can assume that U-864 was fitted with Junkers compressor. German started fi
Forum: Technology and Operations

Hi As far as I know, this book was not translated into English: "Eine andere Sicht Tatsachenbericht eines Torpedo-Obermech. Maat und Fähnrich z. S. Gefahren auf U-459 und U-172", Heinz Trompelt, which partially is available in google books: -- Regards Maciek
Forum: General Discussions

Well, I realized, that email address from the site above is for contact related to the web site content. But maybe it will somehow help you. -- Regads Maciek
Forum: General Discussions

Hi The Museum and Archive has the web site: For contact look here: -- Regards Maciek
Forum: General Discussions

SnakeDoc Wrote: ------------------------------------------------------- > First version of the T-V (Zaunkönig) were powered > from 13T battery, but > it had lowered the speed for same reasons as T-IV > to 24 knots, achieving > running distance of 5700 m. Next version of > Zaunkönig: T-Va and T-Vb were > powered from 17T battery, and had speed and > running dist
Forum: Technology and Operations

Hansel Wrote: ------------------------------------------------------- > About the T-IIIa torpedoes with the 17T batteries, > do you have any idea as to when they were first > introduced, and did they completely replace the > older types? The longer running distance of the electric torpedoes was needed, when torpedoes were equipped with the pattern runnng devices (FAT and
Forum: Technology and Operations

Hi Hansel Wrote: ------------------------------------------------------- > First, about the detonators used in the torpedoes, > were magnetic detonators used with the G7a > torpedoes, or only contact detonators? With G7a torpedoes operationaly were used following pistols: Pi-1, Pi-1a, Pi-1c (with warhead Ka, Ka1, Ka2), Pi-3, Pi-3a, Pi-3c (with warheads Ko, Ko1, Ko2) and ra
Forum: Technology and Operations

Hi In the document "Torpedo G7e Bedienungsvorschrift" there is a chapter "Versager beim Schießen und deren Ursachen" (Torpedo launch failure and causes) and it says: "C. Torpedo läuft nicht, bleibt vor dem Rohr liegen und treibt 1. Toter Mann, Öffnungshebel nicht gelegt, schwergängig oder wieder nach vorn geschlagen, Laufstrecke nicht eingestellt.
Forum: Technology and Operations

Hi Hans hans witteman Wrote: ------------------------------------------------------- > For some reason they probably make some slight > change to the position of the gun mount to adjust > with the breakwave deflection factor, this is only > my own opinion of course. I think, that it is unlikely, that the gun mounting location was changed - it would led to change of the ce
Forum: Modeling and schematics

And some views of the fairing: U-204 U-333 U-408 These above look the same. U-994 U-744 These two look shorter. The late war fairings: U-362 Pictures take from -- Regards Maciek
Forum: Modeling and schematics

HI Hans hans witteman Wrote: ------------------------------------------------------- > Yes i mean the magnetic compass fairing, to me it > seem like they have slight variation about where > the mount was position because we can clearly see > in different VIIC pictures that the the space > between the fairing and the deck gun vary. Well, I think you are right, although t
Forum: Modeling and schematics

Hi Bayonet Wound Wrote: ------------------------------------------------------- > Hello, I would like to know what radios the Type > XXI U-boat used.I have The Radio Transmitter Lo 40 > K 39 and the Radio Receiver(HF) E 52-b2 Köln, > thank you in advance. According to Rössler, the radio room equipment was similar to this used on the type IXC boats (without one long-wave t
Forum: Technology and Operations

Hi Hans hans witteman Wrote: ------------------------------------------------------- > But i still see some error in deck plan from top > like the deck gun not correctly space with the > Gyro fairing. You mean magnetic compass fairing or gyro-compass repeater on the bridge? (as the gyro-compass is in the control room). -- Regards Maciek
Forum: Modeling and schematics

Hi Hans Could you send me this Revell plan? I would like to see, how much the conning tower is shifted. I will also look for the side photos of the type VIIC boats. -- Regards Maciek
Forum: Modeling and schematics

Hi hans witteman Wrote: ------------------------------------------------------- > I was amaze that most of my plans for type VIIC > show the conning tower at different positions and > also differ in height. > > The plan i was using are the Rossler plan, Revell, > and another one i don't know the origin. > > I am refering here to turm type 1. > >
Forum: Modeling and schematics

Hello On the forum found the photo with description: "This excellent photo of U 86, (Obltn. Walter Schug with officers and the senior helmsman), show the boats metal aerial identification device, recessed in the deck beneath the 88-mm gun. When the device was raised, a white disc identified the U-Boat to friendly aircraft." Source: "U-Boot im Focus" - Edition
Forum: Modeling and schematics

radiogaga80 Wrote: ------------------------------------------------------- > Is there any information as to where the torpedoes > were produced and by whom? > > I mean, if they were made by people who were > forced to work for the Germans, it seems only > logical that there would be some sabotage. As far as I know, the torpedoes were manufactured at the Deutsche Werk
Forum: Technology and Operations

radiogaga80 Wrote: ------------------------------------------------------- > Based on what I read Buchheim's Das Boot - there > was quite some sabotage going on when producing > torpedos. Well, while reading Das Boot, I had the impression, that sabotage reffered to the steering gear (gyro or steering engine): "Fehlschüsse! - Alles Fehlschüsse! - Diese Scheißtorpedos!
Forum: Technology and Operations

Hi bill Wrote: ------------------------------------------------------- > On 5 September 1942 U513 attacked SS Saganaga at > BEll Island, Newfoundland. After two torpedoes > were fired it was reported in the KTG, war dairy > of U513, that the run was not heard. No explosion > nothing! The two torpedoes may well still be on > the sea floor. Maybe they were never char
Forum: Technology and Operations

Hi hans witteman Wrote: ------------------------------------------------------- > I search everywhere for some information regarding > the change done to hydrophone sensors from typIIC > to typIID as we see they are no longer located on > the lower bow of the hull. > > Anyone have info regarding the hydrophone sensors > location or type on typIID? As far as I
Forum: Modeling and schematics

Hi SnakeDoc Wrote: > of the U-995 - at box at stb side, between the > navigator table and the forward bulkhead). I mean port side of control room ofcourse. -- Regards Maciek
Forum: Modeling and schematics

Hi hans witteman Wrote: ------------------------------------------------------- > Thank again for your opinion i will model them > with closed walls and some array of valves and > pipes. Right, I think, that it would be the best way. Regulating tank port can be partially hidden by boxes with electronic equipment or elelctric switchboards (as in the control room of the U-995 -
Forum: Modeling and schematics

Hi bill Wrote: ------------------------------------------------------- > A G7e was fired from the tube without the motor > running...how far will travl? Where did you get this information? As far as I know, the electric motor of the G7e torpedo started almost immediately after trigering the starting latch. Starting latch was trigered in the moment of the torpedo launch, and wh
Forum: Technology and Operations